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Hi Andy,
The thing is that there is no mention of the use of any type of sealant on
the clutch ring in any of the literature that I have on the overdrive
units...
Hard to imagine but I have never seen evidence of any on the virgin units
that I have disassembled... I think it was just a dry joint!!!
Michael S
BN1 #174
On Sun, Nov 6, 2016 at 4:06 PM, Austin Healeys List <
austinhealeyslist@gmail.com> wrote:
> HI Michael
>
> It has nothing to do with the studs stretching and everything to do
> with the aluminium housing flexing. It only needs to move a tiny bit
> to unstick the sealant and after that there is no longer anything
> stopping the oil weeping out. I'll run an FEA simulation on it some
> time to show just how flexible the ali case is.
>
> btw, Yamabond, Kawabond, Hondabond, Suzukibond etc are all OEM names
> for ThreeBond sealant.
>
> Andy.
>
>
> On 11/7/16, Michael Salter <michaelsalter@gmail.com> wrote:
> > Out of interest I just did the calculations for the change in length of
> the
> > studs in this case.
> > Assuming:
> > 4 x 5/16" dia studs with an effective diameter of 0.25" each (thread
> root)
> > and a length of 3" (in actual fact only the bottom pair are that long).
> > 0.8 G of braking (which is probably way higher than our tires can
> generate)
> > Young's Modulus of 30,000,000 @ 100 degrees F
> > 700 lbs of engine and gearbox (which is probably very high considering
> that
> > the the mounts are all rubber and the main engine mounts would absorb a
> > fair bit as well)
> > Works out to about 0.00028" of stretch.
> > That's less than 10% of a human hair and only during panic braking if the
> > tie rod is the only thing resisting the load.
> > I think that there must be other contributing factors...
> > Michael S
> > BN1 #174
> >
> > On Sun, Nov 6, 2016 at 11:19 AM, Bluehealey <bluehealey@gmail.com>
> wrote:
> >
>
--
*If you can't fix it with a hammer, you've got an electrical problem.*
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Hi Andy,<br></div><div class=3D"gmail_def=
ault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">The th=
ing is that there is no mention of the use of any type of sealant on the cl=
utch ring in any of the literature that I have on the overdrive units... <b=
r>Hard to imagine but I have never seen evidence of any on the virgin units=
that I have disassembled... I think it was just a dry joint!!!<br></div><d=
iv class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;fo=
nt-size:small">Michael S<br></div><div class=3D"gmail_default" style=3D"fon=
t-family:comic sans ms,sans-serif;font-size:small">BN1 #174<br></div></div>=
<div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, Nov 6, 20=
16 at 4:06 PM, Austin Healeys List <span dir=3D"ltr"><<a href=3D"mailto:=
austinhealeyslist@gmail.com" target=3D"_blank">austinhealeyslist@gmail.com<=
/a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">HI Michael<br>
<br>
It has nothing to do with the studs stretching and everything to do<br>
with the aluminium housing flexing. It only needs to move a tiny bit<br>
to unstick the sealant and after that there is no longer anything<br>
stopping the oil weeping out. I'll run an FEA simulation on it some<br>
time to show just how flexible the ali case is.<br>
<br>
btw, Yamabond, Kawabond, Hondabond, Suzukibond etc are all OEM names<br>
for ThreeBond sealant.<br>
<br>
Andy.<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
On 11/7/16, Michael Salter <<a href=3D"mailto:michaelsalter@gmail.com";>m=
ichaelsalter@gmail.com</a>> wrote:<br>
> Out of interest I just did the calculations for the change in length o=
f the<br>
> studs in this case.<br>
> Assuming:<br>
> 4 x 5/16" dia studs with an effective diameter of 0.25" each=
(thread root)<br>
> and a length of 3" (in actual fact only the bottom pair are that =
long).<br>
> 0.8 G of braking (which is probably way higher than our tires can gene=
rate)<br>
> Young's Modulus of 30,000,000 @ 100 degrees F<br>
> 700 lbs of engine and gearbox (which is probably very high considering=
that<br>
> the the mounts are all rubber and the main engine mounts would absorb =
a<br>
> fair bit as well)<br>
> Works out to about 0.00028" of stretch.<br>
> That's less than 10% of a human hair and only during panic braking=
if the<br>
> tie rod is the only thing resisting the load.<br>
> I think that there must be other contributing factors...<br>
> Michael S<br>
> BN1 #174<br>
><br>
> On Sun, Nov 6, 2016 at 11:19 AM, Bluehealey <<a href=3D"mailto:blue=
healey@gmail.com">bluehealey@gmail.com</a>> wrote:<br>
><br>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><d=
iv><div dir=3D"ltr"><i><font size=3D"2"><span style=3D"color:black">If you =
can't fix it with a hammer, you've got an electrical problem.</span=
></font></i><br><br><div></div><div></div><div></div></div></div></div></di=
v>
</div>
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